[(S)-1-(2-Chloro-acetyl)-pyrrolidin-3-yl]-isopropyl-carbamic acid tert-butyl ester

[(S)-1-(2-Chloro-acetyl)-pyrrolidin-3-yl]-carbamic acid benzyl ester

2-Amino-1-[(S)-3-(benzyl-cyclopropyl-amino)-piperidin-1-yl]-ethanone

2-Amino-1-{2-[(benzyl-cyclopropyl-amino)-methyl]-piperidin-1-yl}-ethanone

(S)-3-[(2-Amino-acetyl)-isopropyl-amino]-pyrrolidine-1-carboxylic acid tert-butyl ester

4-{[(2-Amino-acetyl)-isopropyl-amino]-methyl}-piperidine-1-carboxylic acid tert-butyl ester

(R)-3-[(2-Amino-acetyl)-cyclopropyl-amino]-piperidine-1-carboxylic acid tert-butyl ester

3-[((S)-2-Amino-propionylamino)-methyl]-pyrrolidine-1-carboxylic acid tert-butyl ester

(R)-3-((S)-2-Amino-propionylamino)-piperidine-1-carboxylic acid tert-butyl ester

3-[((S)-2-Amino-propionyl)-methyl-amino]-piperidine-1-carboxylic acid tert-butyl ester

(S)-2-{[((S)-2-Amino-propionyl)-ethyl-amino]-methyl}-pyrrolidine-1-carboxylic acid tert-butyl ester